在PHP中处理文本以查找匹配的字符

Question

How can I process text with some codes.

So suppose I have text as below

Hello {::first_name::} {::last_name::},
How are you?
Your organisation is {::organisation::}

For any text between {:: and ::} should be evaluated to get its value.

I tried exploding text to array using space as delimiter and then parsing array items to look for "{::" and if found get string between "{::" and "::}" and calling database to get this field value. So basically these will be db fields.

Below is the code I have tried

$msg = "Hello {::first_name::} {::last_name::},
 How are you? 
 Your organisation is {::organisation::}";

$msg_array = explode(" ", $msg);
foreach ($msg_array as $str) {
    if (strpos($str, "{::") !== false) {
        $field_str = get_string_between($str, "{::", "::}");
        $field_value = $bean->$field_str; //Logic that gets the value of the field
        $msgStr .= $field_value . " ";
    } else {
        $msgStr .= $str . " ";
    }

}

function get_string_between($string, $start, $end)
{
    $string = ' ' . $string;
    $ini = strpos($string, $start);
    if ($ini == 0) return '';
    $ini += strlen($start);
    $len = strpos($string, $end, $ini) - $ini;
    return substr($string, $ini, $len);
}

Answer 1

Your script seems fine. Your script in fiddle

If you are looking for alternative way, you can try using preg_match_all() with str_replace(array, array, source)

<?php
$bean = new stdClass();
$bean->first_name = 'John';
$bean->last_name = 'Doe';
$bean->organisation = 'PHP Company';

$string = "Hello {::first_name::} {::last_name::}, How are you? Your organisation is {::organisation::}";

// find all placeholders
preg_match_all('/{::(.+?)::}/i', $string, $matches);

$placeholders = $matches[0];

//strings inside placeholders
$parts = $matches[1];

// return values from $bean by matching object property with strings inside placeholders
$replacements = array_map(function($value) use ($bean) {
    // use trim() to remove unexpected space
    return $bean->{trim($value)};
}, $parts);

echo $newstring = str_replace($placeholders, $replacements, $string);

Short format:

$string = "Hello {::first_name::} {::last_name::}, How are you? Your organisation is {::organisation::}";

preg_match_all('/{::(.+?)::}/i', $string, $matches);

$replacements = array_map(function($value) use ($bean) {
    return $bean->{trim($value)};
}, $matches[1]);

echo str_replace($matches[0], $replacements, $string);

And if you prefer to use a function:

function holder_replace($string, $source = null) {
    if (is_object($source)) {

        preg_match_all('/{::(.+?)::}/i', $string, $matches);

        $replacements = array_map(function($value) use ($source) {
            return (property_exists(trim($value), 'source')) ? $source->{trim($value)} : $value;
        }, $matches[1]);

        return str_replace($matches[0], $replacements, $string);        
    }
    return $string;
};

echo holder_replace($string, $bean);

OUTPUT:

Hello John Doe, How are you? Your organisation is PHP Company

fiddle